From Lexicanum

"By the Fell Gods and the destiny of warp, by the death of the False Emperor and the dying of the stars, we bring to you, Warmaster Abaddon, Beloved of Chaos, Despised of Man, this tribute. For now these last days are the final fires burning, the black flames that consume a galaxy, the storms of the warp that drown out life, the End Times and the dawn of a galaxy of Chaos. We swear fealty to the Gods of Chaos and their herald, Abaddon the Despoiler, with this tribute that it might strike fear into the followers of the Corpse-Emperor and that through it they may see the true face of death..."
-- encrypted signal from Chaeroneia ¹

The Castigator-class autonomous bipedal weapons platform was a corrupt STC Titan found on the planet Chaeroneia. It differed from Titans that the Imperium currently uses in that its head did not jut from the chest but actually was above the shoulders, as well as being markedly superior to more recent designs. The Castigator in fact claimed to be the original titan, and that all subsequent titan designs were but crude copies, "pale imitations made by ignorant children". The titan was armed with a twin-barreled cannon that launched daemons (it was later discovered that this was because of an ancient pact with the Ruinous Powers) and a titan class power fist. The Castigator did not believe it was a daemon until Alaric convinced it that was true. It was possessed after millennia in the warp. The Grey Knight Justicar Alaric slew the Castigator while the Grey Knights Dvorn and Haulvern destroyed the STC.¹

Sources

• ¹ Dark Adeptus (Novel) by Ben Counter

See also

• Titans